The house has introduced a bill that would stop online ammunition sales.H.R.2283 - Stop Online Ammunition Sales Act of 2015
Some of the included things will require you to submit a photo ID in-person every time you purchase any ammunition.
You will be reported to the U.S. Attorney General if you purchase more than 1,000 rounds within a five day period and ammunition buyers like you would be registered in a database maintained by the Department of Justice.
If passed into law, these requirements would fundamentally change cartridge collecting in the United States.Please check this bill out.
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It is a concern no doubt, and we should pay attention to things like this and stay ahead of them. However with the Republican controlled House & Senate it is virtually inconceivable that this would pass through. There are bills like this which come up from time to time in the various state legislatures however which do sometimes slip through, and as collectors we should remain vigilant. The NRA / ILA is the primary workhorse in staying ahead of legislation like this, and checking their website will reveal anything like this which might come up. The bill referenced above was introduced by a New Jersey democrat who has Camden, NJ in her district, which is widely regarded as the highest gun-crime ridden (per-capita) city in the U.S.